Optical imaging lens

ABSTRACT

An optical imaging lens includes a first lens element to a sixth lens element. An optical axis region of the object-side surface of the first lens element is convex, an optical axis region of the image-side surface of the second lens element is convex, an optical axis region of the object-side surface of the third lens element is convex, the fourth lens element has negative refracting power, an optical axis region of the object-side surface of the fourth lens element is concave, a periphery region of the object-side surface of the fifth lens element is concave, an optical axis region of the object-side surface of the sixth lens element is convex and an optical axis region of the image-side surface of the sixth lens element is concave to satisfy (G12+T3+G34+T4+G45+T5)/EFL≥1.200.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention generally relates to an optical imaging lens.Specifically speaking, the present invention is directed to an opticalimaging lens for use in a portable electronic device such as a mobilephone, a camera, a tablet personal computer, or a personal digitalassistant (PDA) for taking pictures or for recording videos.

2. Description of the Prior Art

In recent years, the popularity of mobile phones and digital camerasmakes the camera module, including an optical imaging lens, a holder anda sensor, develop quickly. The camera module also has greater andgreater demands to be smaller with the reducing sizes of the mobilephones and digital cameras. With the development and shrinkage of acharge coupled device (CCD) or a complementary metal oxide semiconductorelement (CMOS), the optical imaging lens set which is installed in thecamera module shrinks as well to meet the demands.

As far as an optical imaging lens of six lens elements is concerned, adistance from the object-side surface of the first lens element to animage plane along the optical axis is large and such a large distance isunfavorable for the size reduction of a mobile phone and of a digitalcamera. In addition, it is also important to enlarge a field of view aswell as to satisfy the higher and higher demands for the imagingquality. Therefore, it is still needed to provide a novel opticalimaging lens with good imaging quality and a shorter system length inthis field.

SUMMARY OF THE INVENTION

In the light of the above, various embodiments of the present inventionpropose an optical imaging lens of six lens elements which has reducedsystem length, ensured imaging quality, a larger field of view, goodoptical performance and is technically possible. The optical imaginglens of six lens elements of the present invention from an object sideto an image side in order along an optical axis has a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element. Each first lenselement, second lens element, third lens element, fourth lens element,fifth lens element and sixth lens element respectively has anobject-side surface which faces toward the object side and allowsimaging rays to pass through as well as an image-side surface whichfaces toward the image side and allows the imaging rays to pass through.

In order to facilitate clearness of the parameters represented by thepresent invention and the drawings, it is defined in this specificationand the drawings: T1 is a thickness of the first lens element along theoptical axis; T2 is a thickness of the second lens element along theoptical axis; T3 is a thickness of the third lens element along theoptical axis; T4 is a thickness of the fourth lens element along theoptical axis; T5 is a thickness of the fifth lens element along theoptical axis; and T6 is a thickness of the sixth lens element along theoptical axis. G12 is an air gap between the first lens element and thesecond lens element along the optical axis; G23 is an air gap betweenthe second lens element and the third lens element along the opticalaxis; G34 is an air gap between the third lens element and the fourthlens element along the optical axis; G45 is an air gap between thefourth lens element and the fifth lens element along the optical axis;G56 is an air gap between the fifth lens element and the sixth lenselement along the optical axis. ALT is a sum of thicknesses of all thesix lens elements along the optical axis. AAG is a sum of five air gapsfrom the first lens element to the sixth lens element along the opticalaxis. In addition, TTL is a distance from the object-side surface of thefirst lens element to an image plane along the optical axis, and that isthe system length of the optical imaging lens; EFL is an effective focallength of the optical imaging lens; TL is a distance from theobject-side surface of the first lens element to the image-side surfaceof the sixth lens element along the optical axis. BFL is a distance fromthe image-side surface of the sixth lens element to the image planealong the optical axis.

In one embodiment, an optical axis region of the object-side surface ofthe first lens element is convex. An optical axis region of theimage-side surface of the second lens element is convex. An optical axisregion of the object-side surface of the third lens element is convex.The fourth lens element has negative refracting power and an opticalaxis region of the object-side surface of the fourth lens element isconcave. A periphery region of the object-side surface of the fifth lenselement is concave. An optical axis region of the object-side surface ofthe sixth lens element is convex and an optical axis region of theimage-side surface of the sixth lens element is concave. Only theabove-mentioned six lens elements of the optical imaging lens haverefracting power and the optical imaging lens satisfies the conditionalformula (G12+T3+G34+T4+G45+T5)/EFL≥1.200.

In the optical imaging lens of the present invention, the embodimentsmay also selectively satisfy the following optical conditions:

BFL/(T2+G56)≥1.000;

ALT/(G23+T3+G34)≤3.100;

ALT/EFL≤2.300;

AAG/(T4+G45)≥3.900;

(T6+BFL)/T1≥3.300;

TL/(T4+T5)≤5.100;

(T3+G34)/T1≤2.800;

TTL/(G12+G34)≤5.700;

(G23+T3)/T6≤3.100;

(T3+T5)/T1≤4.000;

EFL/(G12+G56)≥1.500;

(T5+T6)/T4≤4.900;

TL/BFL≤4.200;

(G12+G23)/T2≥1.200;

G12/(G34+G45+G56)≤3.000;

(G12+G45)/T4≤4.600;

(T2+T3+T5)/(T1+T4)≤3.400;

(G12+G34)/T6≥2.400;

(T5+G56)/T6≤2.700.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1-5 illustrate the methods for determining the surface shapes andfor determining an optical axis region and a periphery region of onelens element.

FIG. 6 illustrates a first embodiment of the optical imaging lens of thepresent invention.

FIG. 7A illustrates the longitudinal spherical aberration on the imageplane of the first embodiment.

FIG. 7B illustrates the field curvature aberration on the sagittaldirection of the first embodiment.

FIG. 7C illustrates the field curvature aberration on the tangentialdirection of the first embodiment.

FIG. 7D illustrates the distortion aberration of the first embodiment.

FIG. 8 illustrates a second embodiment of the optical imaging lens ofthe present invention.

FIG. 9A illustrates the longitudinal spherical aberration on the imageplane of the second embodiment.

FIG. 9B illustrates the field curvature aberration on the sagittaldirection of the second embodiment.

FIG. 9C illustrates the field curvature aberration on the tangentialdirection of the second embodiment.

FIG. 9D illustrates the distortion aberration of the second embodiment.

FIG. 10 illustrates a third embodiment of the optical imaging lens ofthe present invention.

FIG. 11A illustrates the longitudinal spherical aberration on the imageplane of the third embodiment.

FIG. 11B illustrates the field curvature aberration on the sagittaldirection of the third embodiment.

FIG. 11C illustrates the field curvature aberration on the tangentialdirection of the third embodiment.

FIG. 11D illustrates the distortion aberration of the third embodiment.

FIG. 12 illustrates a fourth embodiment of the optical imaging lens ofthe present invention.

FIG. 13A illustrates the longitudinal spherical aberration on the imageplane of the fourth embodiment.

FIG. 13B illustrates the field curvature aberration on the sagittaldirection of the fourth embodiment.

FIG. 13C illustrates the field curvature aberration on the tangentialdirection of the fourth embodiment.

FIG. 13D illustrates the distortion aberration of the fourth embodiment.

FIG. 14 illustrates a fifth embodiment of the optical imaging lens ofthe present invention.

FIG. 15A illustrates the longitudinal spherical aberration on the imageplane of the fifth embodiment.

FIG. 15B illustrates the field curvature aberration on the sagittaldirection of the fifth embodiment.

FIG. 15C illustrates the field curvature aberration on the tangentialdirection of the fifth embodiment.

FIG. 15D illustrates the distortion aberration of the fifth embodiment.

FIG. 16 illustrates a sixth embodiment of the optical imaging lens ofthe present invention.

FIG. 17A illustrates the longitudinal spherical aberration on the imageplane of the sixth embodiment.

FIG. 17B illustrates the field curvature aberration on the sagittaldirection of the sixth embodiment.

FIG. 17C illustrates the field curvature aberration on the tangentialdirection of the sixth embodiment.

FIG. 17D illustrates the distortion aberration of the sixth embodiment.

FIG. 18 illustrates a seventh embodiment of the optical imaging lens ofthe present invention.

FIG. 19A illustrates the longitudinal spherical aberration on the imageplane of the seventh embodiment.

FIG. 19B illustrates the field curvature aberration on the sagittaldirection of the seventh embodiment.

FIG. 19C illustrates the field curvature aberration on the tangentialdirection of the seventh embodiment.

FIG. 19D illustrates the distortion aberration of the seventhembodiment.

FIG. 20 illustrates an eighth embodiment of the optical imaging lens ofthe present invention.

FIG. 21A illustrates the longitudinal spherical aberration on the imageplane of the eighth embodiment.

FIG. 21B illustrates the field curvature aberration on the sagittaldirection of the eighth embodiment.

FIG. 21C illustrates the field curvature aberration on the tangentialdirection of the eighth embodiment.

FIG. 21D illustrates the distortion aberration of the eighth embodiment.

FIG. 22 illustrates a ninth embodiment of the optical imaging lens ofthe present invention.

FIG. 23A illustrates the longitudinal spherical aberration on the imageplane of the ninth embodiment.

FIG. 23B illustrates the field curvature aberration on the sagittaldirection of the ninth embodiment.

FIG. 23C illustrates the field curvature aberration on the tangentialdirection of the ninth embodiment.

FIG. 23D illustrates the distortion aberration of the ninth embodiment.

FIG. 24 illustrates a tenth embodiment of the optical imaging lens ofthe present invention.

FIG. 25A illustrates the longitudinal spherical aberration on the imageplane of the tenth embodiment.

FIG. 25B illustrates the field curvature aberration on the sagittaldirection of the tenth embodiment.

FIG. 25C illustrates the field curvature aberration on the tangentialdirection of the tenth embodiment.

FIG. 25D illustrates the distortion aberration of the tenth embodiment.

FIG. 26 shows the optical data of the first embodiment of the opticalimaging lens.

FIG. 27 shows the aspheric surface data of the first embodiment.

FIG. 28 shows the optical data of the second embodiment of the opticalimaging lens.

FIG. 29 shows the aspheric surface data of the second embodiment.

FIG. 30 shows the optical data of the third embodiment of the opticalimaging lens.

FIG. 31 shows the aspheric surface data of the third embodiment.

FIG. 32 shows the optical data of the fourth embodiment of the opticalimaging lens.

FIG. 33 shows the aspheric surface data of the fourth embodiment.

FIG. 34 shows the optical data of the fifth embodiment of the opticalimaging lens.

FIG. 35 shows the aspheric surface data of the fifth embodiment.

FIG. 36 shows the optical data of the sixth embodiment of the opticalimaging lens.

FIG. 37 shows the aspheric surface data of the sixth embodiment.

FIG. 38 shows the optical data of the seventh embodiment of the opticalimaging lens.

FIG. 39 shows the aspheric surface data of the seventh embodiment.

FIG. 40 shows the optical data of the eighth embodiment of the opticalimaging lens.

FIG. 41 shows the aspheric surface data of the eighth embodiment.

FIG. 42 shows the optical data of the ninth embodiment of the opticalimaging lens.

FIG. 43 shows the aspheric surface data of the ninth embodiment.

FIG. 44 shows the optical data of the tenth embodiment of the opticalimaging lens.

FIG. 45 shows the aspheric surface data of the tenth embodiment.

FIG. 46 shows some important parameters in the embodiments.

FIG. 47 shows some important ratios in the embodiments.

DETAILED DESCRIPTION

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1, a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1, the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2, optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2. Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2. Accordingly, since theextension line EL of the ray intersects the optical axis I on the objectside A1 of the lens element 200, periphery region Z2 is concave. In thelens element 200 illustrated in FIG. 2, the first transition point TP1is the border of the optical axis region and the periphery region, i.e.,TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Ze max and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex- (concave-) region,” can be usedalternatively.

FIG. 3, FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3, only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3, since the shape of the optical axis regionZ1 is concave, the shape of the periphery region Z2 will be convex asthe shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4, a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4, theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5, the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

As shown in FIG. 6, the optical imaging lens 1 of six lens elements ofthe present invention, sequentially located from an object side A1(where an object is located) to an image side A2 along an optical axisI, has a first lens element 10, an aperture stop 80, a second lenselement 20, a third lens element 30, a fourth lens element 40, a fifthlens element 50, a sixth lens element 60, a filter 90 and an image plane91. Generally speaking, the first lens element 10, the second lenselement 20, the third lens element 30, the fourth lens element 40, thefifth lens element 50 and the sixth lens element 60 may be made of atransparent plastic material but the present invention is not limited tothis, and each lens element has an appropriate refracting power. In thepresent invention, lens elements having refracting power included by theoptical imaging lens 1 are only the six lens elements (the first lenselement 10, the second lens element 20, the third lens element 30, thefourth lens element 40, the fifth lens element 50 and the sixth lenselement 60) described above. The optical axis I is the optical axis ofthe entire optical imaging lens 1, and the optical axis of each of thelens elements coincides with the optical axis of the optical imaginglens 1.

Furthermore, the optical imaging lens 1 includes an aperture stop (ape.stop) 80 disposed in an appropriate position. In FIG. 6, the aperturestop 80 is disposed between the first lens element 10 and the secondlens element 20. When light emitted or reflected by an object (notshown) which is located at the object side A1 enters the optical imaginglens 1 of the present invention, it forms a clear and sharp image on theimage plane 91 at the image side A2 after passing through the first lenselement 10, the aperture stop 80, the second lens element 20, the thirdlens element 30, the fourth lens element 40, the fifth lens element 50,the sixth lens element 60, and the filter 90. In one embodiment of thepresent invention, the filter 90 may be a filter of various suitablefunctions to filter out light of a specific wavelength, for embodiment,the filter 90 may be an infrared cut filter (infrared cut-off filter),placed between the sixth lens element 60 and the image plane 91 to keepthe infrared in the imaging rays from reaching the image plane 91 tojeopardize the imaging quality.

The first lens element 10, the second lens element 20, the third lenselement 30, the fourth lens element 40, the fifth lens element 50 andthe sixth lens element 60 of the optical imaging lens 1 each has anobject-side surface 11, 21, 31, 41, 51 and 61 facing toward the objectside A1 and allowing imaging rays to pass through as well as animage-side surface 12, 22, 32, 42, 52 and 62 facing toward the imageside A2 and allowing the imaging rays to pass through. Furthermore, eachobject-side surface and image-side surface of lens elements in theoptical imaging lens of present invention has optical axis region andperiphery region.

Each lens element in the optical imaging lens 1 of the present inventionfurther has a thickness T along the optical axis I. For embodiment, thefirst lens element 10 has a first lens element thickness T1, the secondlens element 20 has a second lens element thickness T2, the third lenselement 30 has a third lens element thickness T3, the fourth lenselement 40 has a fourth lens element thickness T4, the fifth lenselement 50 has a fifth lens element thickness T5, and the sixth lenselement 60 has a sixth lens element thickness T6. Therefore, a sum ofthicknesses of all the six lens elements in the optical imaging lens 1along the optical axis I is ALT=T1+T2+T3+T4+T5+T6.

In addition, between two adjacent lens elements in the optical imaginglens 1 of the present invention there may be an air gap along theoptical axis I. In embodiments, there is an air gap G12 between thefirst lens element 10 and the second lens element 20, an air gap G23between the second lens element 20 and the third lens element 30, an airgap G34 between the third lens element 30 and the fourth lens element40, an air gap G45 between the fourth lens element 40 and the fifth lenselement 50 as well as an air gap G56 between the fifth lens element 50and the sixth lens element 60. Therefore, a sum of five air gaps fromthe first lens element 10 to the sixth lens element 60 along the opticalaxis I is AAG=G12+G23+G34+G45+G56.

In addition, a distance from the object-side surface 11 of the firstlens element 10 to the image plane 91, namely a system length of theoptical imaging lens 1 along the optical axis I is TTL; an effectivefocal length of the optical imaging lens is EFL; a distance from theobject-side surface 11 of the first lens element 10 to the image-sidesurface 62 of the sixth lens element 60 along the optical axis I is TL.A distance from the image-side surface 62 of the sixth lens element 60to the filter 90 along the optical axis I is G6F; a thickness of thefilter 90 along the optical axis I is TF; a distance from the filter 90to the image plane 91 along the optical axis I is GFP; and a distancefrom the image-side surface 62 of the sixth lens element 60 to the imageplane 91 along the optical axis I is BFL. Therefore, BFL=G6F+TF+GFP.ImgH is an image height of the optical imaging lens 1.

Furthermore, a focal length of the first lens element 10 is f1; a focallength of the second lens element 20 is f2; a focal length of the thirdlens element 30 is f3; a focal length of the fourth lens element 40 isf4; a focal length of the fifth lens element 50 is f5; a focal length ofthe sixth lens element 60 is f6; a refractive index of the first lenselement 10 is n1; a refractive index of the second lens element 20 isn2; a refractive index of the third lens element 30 is n3; a refractiveindex of the fourth lens element 40 is n4; a refractive index of thefifth lens element 50 is n5; a refractive index of the sixth lenselement 60 is n6; an Abbe number of the first lens element 10 is υ1; anAbbe number of the second lens element 20 is υ2; an Abbe number of thethird lens element 30 is υ3; and an Abbe number of the fourth lenselement 40 is υ4; an Abbe number of the fifth lens element 50 is υ5; andan Abbe number of the sixth lens element 60 is υ6.

First Embodiment

Please refer to FIG. 6 which illustrates the first embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG. 7Afor the longitudinal spherical aberration on the image plane 91 of thefirst embodiment; please refer to FIG. 7B for the field curvatureaberration on the sagittal direction; please refer to FIG. 7C for thefield curvature aberration on the tangential direction; and please referto FIG. 7D for the distortion aberration. The Y axis of the sphericalaberration in each embodiment is “field of view” for 1.0. The Y axis ofthe field curvature aberration and the distortion aberration in eachembodiment stands for the “image height” (ImgH), which is 3.325 mm.

Only the six lens elements 10, 20, 30, 40, 50 and 60 of the opticalimaging lens 1 of the first embodiment have refracting power. Theoptical imaging lens 1 also has an aperture stop 80, a filter 90, and animage plane 91. The aperture stop 80 is provided between the first lenselement 10 and the second lens element 20. The filter 90 may be used forpreventing specific wavelength light (such as the infrared light)reaching the image plane 91 to adversely affect the imaging quality.

The first lens element 10 has negative refracting power. An optical axisregion 13 and a periphery region 14 of the object-side surface 11 of thefirst lens element 10 are convex. An optical axis region 16 and aperiphery region 17 of the image-side surface 12 of the first lenselement 10 are concave. Besides, both the object-side surface 11 and theimage-side surface 12 of the first lens element 10 are asphericalsurfaces, but it is not limited thereto.

The second lens element 20 has positive refracting power. An opticalaxis region 23 and a periphery region 24 of the object-side surface 21of the second lens element 20 are convex. An optical axis region 26 anda periphery region 27 of the image-side surface 22 of the second lenselement 20 are convex. Besides, both the object-side surface 21 and theimage-side surface 22 of the second lens element 20 are asphericalsurfaces, but it is not limited thereto.

The third lens element 30 has positive refracting power. An optical axisregion 33 and a periphery region 34 of the object-side surface 31 of thethird lens element 30 are convex. An optical axis region 36 and aperiphery region 37 of the image-side surface 32 of the third lenselement 30 are convex. Besides, both the object-side surface 31 and theimage-side surface 32 of the third lens element 30 are asphericalsurfaces, but it is not limited thereto.

The fourth lens element 40 has negative refracting power. An opticalaxis region 43 and a periphery region 44 of the object-side surface 41of the fourth lens element 40 are concave. An optical axis region 46 ofthe image-side surface 42 of the fourth lens element 40 is convex and aperiphery region 47 of the image-side surface 42 of the fourth lenselement 40 is concave. Besides, both the object-side surface 41 and theimage-side surface 42 of the fourth lens element 40 are asphericalsurfaces, but it is not limited thereto.

The fifth lens element 50 has positive refracting power. An optical axisregion 53 and a periphery region 54 of the object-side surface 51 of thefifth lens element 50 are concave. An optical axis region 56 and aperiphery region 57 of the image-side surface 52 of the fifth lenselement 50 are convex. Besides, both the object-side surface 51 and theimage-side surface 52 of the fifth lens element 50 are asphericalsurfaces, but it is not limited thereto.

The sixth lens element 60 has positive refracting power. An optical axisregion 63 of the object-side surface 61 of the sixth lens element 60 isconvex and a periphery region 64 of the object-side surface 61 of thesixth lens element 60 is concave. An optical axis region 66 of theimage-side surface 62 of the sixth lens element 60 is concave and aperiphery region 67 of the image-side surface 62 of the sixth lenselement 60 is convex. Besides, both the object-side surface 61 and theimage-side surface 62 of the sixth lens element 60 are asphericalsurfaces, but it is not limited thereto. The filter 90 is disposedbetween the image-side surface 62 of the sixth lens element 60 and theimage plane 91.

In the first lens element 10, the second lens element 20, the third lenselement 30, the fourth lens element 40, the fifth lens element 50 andthe sixth lens element 60 of the optical imaging lens element 1 of thepresent invention, there are 12 surfaces, such as the object-sidesurfaces 11/21/31/41/51/61 and the image-side surfaces12/22/32/42/52/62. If a surface is aspherical, these asphericcoefficients are defined according to the following formula:

${Z(Y)} = {{\frac{Y^{2}}{R}\text{/}( {1 + \sqrt{1 - {( {1 + K} )\frac{Y^{2}}{R^{2}}}}} )} + {\sum\limits_{i = 1}^{n}\;{a_{2\; i} \times Y^{2\; i}}}}$In which:R represents the curvature radius of the lens element surface;Z represents the depth of an aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis I and the tangent plane of the vertex on theoptical axis I of the aspherical surface);Y represents a vertical distance from a point on the aspherical surfaceto the optical axis I;K is a conic constant; anda_(2i) is the aspheric coefficient of the 2i^(th) order.

The optical data of the first embodiment of the optical imaging lens 1are shown in FIG. 26 while the aspheric surface data are shown in FIG.27. In the present embodiments of the optical imaging lens, the f-numberof the entire optical imaging lens is Fno, EFL is the effective focallength, HFOV stands for the half field of view of the entire opticalimaging lens, and the unit for the radius, the thickness and the focallength is in millimeters (mm). In this embodiment, EFL=2.012 mm;HFOV=60.079 degrees; TTL=5.512 mm; Fno=2.2; ImgH=3.325 mm.

Second Embodiment

Please refer to FIG. 8 which illustrates the second embodiment of theoptical imaging lens 1 of the present invention. It is noted that fromthe second embodiment to the following embodiments, in order to simplifythe figures, only the components different from what the firstembodiment has, and the basic lens elements will be labeled in figures.Other components that are the same as what the first embodiment has,such as a convex surface or a concave surface, are omitted in thefollowing embodiments. Please refer to FIG. 9A for the longitudinalspherical aberration on the image plane 91 of the second embodiment,please refer to FIG. 9B for the field curvature aberration on thesagittal direction, please refer to FIG. 9C for the field curvatureaberration on the tangential direction, and please refer to FIG. 9D forthe distortion aberration. The components in this embodiment are similarto those in the first embodiment, but the optical data such as therefracting power, the radius, the lens thickness, the aspheric surfaceor the back focal length in this embodiment are different from theoptical data in the first embodiment. Besides, in this embodiment, aperiphery region 24 of the object-side surface 21 of the second lenselement 20 is concave, a periphery region 34 of the object-side surface31 of the third lens element 30 is concave, a periphery region 47 of theimage-side surface 42 of the fourth lens element 40 is convex and anoptical axis region 53 of the object-side surface 51 of the fifth lenselement 50 is convex.

The optical data of the second embodiment of the optical imaging lensare shown in FIG. 28 while the aspheric surface data are shown in FIG.29. In this embodiment, EFL=1.524 mm; HFOV=60.107 degrees; TTL=6.097 mm;Fno=1.7; ImgH=2.520 mm. In particular, the field curvature aberration onthe tangential direction of the optical imaging lens in this embodimentis better than that of the optical imaging lens in the first embodiment.

Third Embodiment

Please refer to FIG. 10 which illustrates the third embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.11A for the longitudinal spherical aberration on the image plane 91 ofthe third embodiment; please refer to FIG. 11B for the field curvatureaberration on the sagittal direction; please refer to FIG. 11C for thefield curvature aberration on the tangential direction; and please referto FIG. 11D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the refracting power, the radius, the lens thickness, theaspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is concave and an optical axis region 53 ofthe object-side surface 51 of the fifth lens element 50 is convex.

The optical data of the third embodiment of the optical imaging lens areshown in FIG. 30 while the aspheric surface data are shown in FIG. 31.In this embodiment, EFL=1.899 mm; HFOV=60.079 degrees; TTL=5.637 mm;Fno=2.1; ImgH=3.141 mm.

Fourth Embodiment

Please refer to FIG. 12 which illustrates the fourth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.13A for the longitudinal spherical aberration on the image plane 91 ofthe fourth embodiment; please refer to FIG. 13B for the field curvatureaberration on the sagittal direction; please refer to FIG. 13C for thefield curvature aberration on the tangential direction; and please referto FIG. 13D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the refracting power, the radius, the lens thickness, theaspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is concave and an optical axis region 53 ofthe object-side surface 51 of the fifth lens element 50 is convex.

The optical data of the fourth embodiment of the optical imaging lensare shown in FIG. 32 while the aspheric surface data are shown in FIG.33. In this embodiment, EFL=1.897 mm; HFOV=60.079 degrees; TTL=5.720 mm;Fno=2.1; ImgH=3.142 mm.

Fifth Embodiment

Please refer to FIG. 14 which illustrates the fifth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.15A for the longitudinal spherical aberration on the image plane 91 ofthe fifth embodiment; please refer to FIG. 15B for the field curvatureaberration on the sagittal direction; please refer to FIG. 15C for thefield curvature aberration on the tangential direction, and please referto FIG. 15D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the refracting power, the radius, the lens thickness, theaspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is concave, an optical axis region 46 of theimage-side surface 42 of the fourth lens element 40 is concave and anoptical axis region 53 of the object-side surface 51 of the fifth lenselement 50 is convex.

The optical data of the fifth embodiment of the optical imaging lens areshown in FIG. 34 while the aspheric surface data are shown in FIG. 35.In this embodiment, EFL=1.465 mm; HFOV=60.079 degrees; TTL=6.065 mm;Fno=1.6; ImgH=2.425 mm. In particular, the field curvature aberration onthe tangential direction of the optical imaging lens in this embodimentis better than that of the optical imaging lens in the first embodiment.

Sixth Embodiment

Please refer to FIG. 16 which illustrates the sixth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.17A for the longitudinal spherical aberration on the image plane 91 ofthe sixth embodiment; please refer to FIG. 17B for the field curvatureaberration on the sagittal direction; please refer to FIG. 17C for thefield curvature aberration on the tangential direction, and please referto FIG. 17D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the refracting power, the radius, the lens thickness, theaspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is concave, an optical axis region 46 of theimage-side surface 42 of the fourth lens element 40 is concave and anoptical axis region 53 of the object-side surface 51 of the fifth lenselement 50 is convex.

The optical data of the sixth embodiment of the optical imaging lens areshown in FIG. 36 while the aspheric surface data are shown in FIG. 37.In this embodiment, EFL=1.877 mm; HFOV=60.079 degrees; TTL=5.743 mm;Fno=2.1; ImgH=3.110 mm.

Seventh Embodiment

Please refer to FIG. 18 which illustrates the seventh embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.19A for the longitudinal spherical aberration on the image plane 91 ofthe seventh embodiment; please refer to FIG. 19B for the field curvatureaberration on the sagittal direction; please refer to FIG. 19C for thefield curvature aberration on the tangential direction, and please referto FIG. 19D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the refracting power, the radius, the lens thickness, theaspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is concave, an optical axis region 46 of theimage-side surface 42 of the fourth lens element 40 is concave and anoptical axis region 53 of the object-side surface 51 of the fifth lenselement 50 is convex.

The optical data of the seventh embodiment of the optical imaging lensare shown in FIG. 38 while the aspheric surface data are shown in FIG.39. In this embodiment, EFL=1.794 mm; HFOV=60.079 degrees; TTL=5.909 mm;Fno=2.0; ImgH=2.970 mm.

Eighth Embodiment

Please refer to FIG. 20 which illustrates the eighth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.21A for the longitudinal spherical aberration on the image plane 91 ofthe eighth embodiment; please refer to FIG. 21B for the field curvatureaberration on the sagittal direction; please refer to FIG. 21C for thefield curvature aberration on the tangential direction, and please referto FIG. 21D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the refracting power, the radius, the lens thickness, theaspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, an optical axis region 53 of the object-side surface 51of the fifth lens element 50 is convex.

The optical data of the eighth embodiment of the optical imaging lensare shown in FIG. 40 while the aspheric surface data are shown in FIG.41. In this embodiment, EFL=1.881 mm; HFOV=60.079 degrees; TTL=5.713 mm;Fno=2.1; ImgH=3.116 mm.

Ninth Embodiment

Please refer to FIG. 22 which illustrates the ninth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.23A for the longitudinal spherical aberration on the image plane 91 ofthe ninth embodiment; please refer to FIG. 23B for the field curvatureaberration on the sagittal direction; please refer to FIG. 23C for thefield curvature aberration on the tangential direction, and please referto FIG. 23D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the refracting power, the radius, the lens thickness, theaspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is concave, an optical axis region 46 of theimage-side surface 42 of the fourth lens element 40 is concave and anoptical axis region 53 of the object-side surface 51 of the fifth lenselement 50 is convex.

The optical data of the ninth embodiment of the optical imaging lens areshown in FIG. 42 while the aspheric surface data are shown in FIG. 43.In this embodiment, EFL=1.693 mm; HFOV=60.079 degrees; TTL=5.505 mm;Fno=1.9; ImgH=2.803 mm. In particular, the field curvature aberration onthe tangential direction of the optical imaging lens in this embodimentis better than that of the optical imaging lens in the first embodiment.

Tenth Embodiment

Please refer to FIG. 24 which illustrates the tenth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.25A for the longitudinal spherical aberration on the image plane 91 ofthe tenth embodiment; please refer to FIG. 25B for the field curvatureaberration on the sagittal direction; please refer to FIG. 25C for thefield curvature aberration on the tangential direction, and please referto FIG. 25D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the refracting power, the radius, the lens thickness, theaspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is concave and an optical axis region 53 ofthe object-side surface 51 of the fifth lens element 50 is convex.

The optical data of the tenth embodiment of the optical imaging lens areshown in FIG. 44 while the aspheric surface data are shown in FIG. 45.In this embodiment, EFL=1.744 mm; HFOV=60.079 degrees; TTL=5.446 mm;Fno=1.9; ImgH=2.886 mm. In particular, the field curvature aberration onthe tangential direction of the optical imaging lens in this embodimentis better than that of the optical imaging lens in the first embodiment.

Some important parameters and ratios in each embodiment are shown inFIG. 46 and in FIG. 47.

The numeral value ranges within the maximum and minimum values obtainedfrom the combination ratio relationships of the optical parametersdisclosed in each embodiment of the invention can all be implementedaccordingly.

The applicants found that by the following designs, the lensconfiguration of the present invention has the following features andcorresponding advantages:

1. An optical axis region 13 of the object-side surface 11 of the firstlens element 10 being convex is effectively to focus rays of light. Thismay also go with an optical axis region 26 of the image-side surface 22of the second lens element 20 being convex and with an optical axisregion 33 of the object-side surface 31 of the third lens element 30being convex to correct the aberration of the first lens element 10.These may further go with the fourth lens element 40 having negativerefracting power, with an optical axis region 43 of the object-sidesurface 41 of the fourth lens element 40 being concave, with a peripheryregion 54 of the object-side surface 51 of the fifth lens element 50being concave, with an optical axis region 63 of the object-side surface61 of the sixth lens element 60 being convex and with an optical axisregion 66 of the image-side surface 62 of the sixth lens element 60being concave, to more effectively reduce the field curvature aberrationand the distortion aberration in order to optimize the resultant imagingquality of the optical imaging lens system.2. If the condition of (G12+T3+G34+T4+G45+T5)/EFL≥1.200 can besatisfied, it is beneficial for enlarging the field of view of theoptical imaging lens system. The preferable range of the above conditionis 1.200≤(G12+T3+G34+T4+G45+T5)/EFL≤2.100.3. In order to reduce the system length of the optical imaging lens 1along the optical axis I and simultaneously to ensure the imagingquality, the thickness of each lens element or the air gaps should beappropriately adjusted. However, the assembly or the manufacturingdifficulty should be taken into consideration. If the followingnumerical conditions are selectively satisfied, the optical imaging lens1 of the present invention may have better optical arrangements:1) BFL/(T2+G56)≥1.000, and the preferable range is1.000≤BFL/(T2+G56)≤2.200;2) ALT/(G23+T3+G34)≤3.100, and the preferable range is2.500≤ALT/(G23+T3+G34)≤3.100;3) ALT/EFL≤2.300, and the preferable range is 1.400≤ALT/EFL≤2.300;4) AAG/(T4+G45)≥3.900, and the preferable range is3.900≤AAG/(T4+G45)≤5.100;5) (T6+BFL)/T1≥3.300, and the preferable range is3.300≤(T6+BFL)/T1≤5.100;6) TL/(T4+T5)≤5.100, and the preferable range is 4.200≤TL/(T4+T5)≤5.100;7) (T3+G34)/T1≤2.800, and the preferable range is1.800≤(T3+G34)/T1≤2.800;8) TTL/(G12+G34)≤5.700, and the preferable range is4.700≤TTL/(G12+G34)≤5.700;9) (G23+T3)/T6≤3.100, and the preferable range is1.700≤(G23+T3)/T6≤3.100;10) (T3+T5)/T1≤4.000, and the preferable range is2.900≤(T3+T5)/T1≤4.000;11) EFL/(G12+G56)≥1.500, and the preferable range is1.500≤EFL/(G12+G56)≤2.600;12) (T5+T6)/T4≤4.900, and the preferable range is4.000≤(T5+T6)/T4≤4.900;13) TL/BFL≤4.200, and the preferable range is 3.000≤TL/BFL≤4.200;14) (G12+G23)/T2≥1.200, and the preferable range is1.200≤(G12+G23)/T2≤2.000;15) G12/(G34+G45+G56)≤3.000, and the preferable range is1.800≤G12/(G34+G45+G56)≤3.000;16) (G12+G45)/T4≤4.600, and the preferable range is3.200≤(G12+G45)/T4≤4.600;17) (T2+T3+T5)/(T1+T4)≤3.400, and the preferable range is2.800≤(T2+T3+T5)/(T1+T4)≤3.400;18) (G12+G34)/T6≥2.400, and the preferable range is2.400≤((G12+G34))/T6≤3.500;19) (T5+G56)/T6≤2.700, and the preferable range is1.900≤(T5+G56)/T6≤2.700.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. An optical imaging lens, from an object side toan image side in order along an optical axis comprising: a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, and a sixth lens element, the first lenselement to the sixth lens element each having an object-side surfacefacing toward the object side and allowing imaging rays to pass throughas well as an image-side surface facing toward the image side andallowing the imaging rays to pass through, wherein: an optical axisregion of the object-side surface of the first lens element is convex;an optical axis region of the image-side surface of the second lenselement is convex; an optical axis region of the object-side surface ofthe third lens element is convex; the fourth lens element has negativerefracting power and an optical axis region of the object-side surfaceof the fourth lens element is concave; a periphery region of theobject-side surface of the fifth lens element is concave; and an opticalaxis region of the object-side surface of the sixth lens element isconvex and an optical axis region of the image-side surface of the sixthlens element is concave; wherein only the above-mentioned six lenselements of the optical imaging lens have refracting power; wherein, EFLis an effective focal length of the optical imaging lens, T3 is athickness of the third lens element along the optical axis, T4 is athickness of the fourth lens element along the optical axis, T5 is athickness of the fifth lens element along the optical axis, T6 is athickness of the sixth lens element along the optical axis, G12 is anair gap between the first lens element and the second lens element alongthe optical axis, G34 is an air gap between the third lens element andthe fourth lens element along the optical axis, G45 is an air gapbetween the fourth lens element and the fifth lens element along theoptical axis, and the optical imaging lens satisfies the relationship:(G12+T3+G34+T4+G45+T5)/EFL≥1.200 and (G12+G34)/T6≥2.400.
 2. The opticalimaging lens of claim 1, wherein BFL is a distance from the image-sidesurface of the sixth lens element to an image plane along the opticalaxis, T2 is a thickness of the second lens element along the opticalaxis, G56 is an air gap between the fifth lens element and the sixthlens element along the optical axis, and the optical imaging lenssatisfies the relationship: BFL/(T2+G56)≥1.000.
 3. The optical imaginglens of claim 1, wherein ALT is a sum of thicknesses of all the six lenselements along the optical axis, G23 is an air gap between the secondlens element and the third lens element along the optical axis, and theoptical imaging lens satisfies the relationship: ALT/(G23+T3+G34)≤3.100.4. The optical imaging lens of claim 1, wherein ALT is a sum ofthicknesses of all the six lens elements along the optical axis, and theoptical imaging lens satisfies the relationship: ALT/EFL≤2.300.
 5. Theoptical imaging lens of claim 1, wherein AAG is a sum of five air gapsfrom the first lens element to the sixth lens element along the opticalaxis, and the optical imaging lens satisfies the relationship:AAG/(T4+G45)≥3.900.
 6. The optical imaging lens of claim 1, wherein BFLis a distance from the image-side surface of the sixth lens element toan image plane along the optical axis, T1 is a thickness of the firstlens element along the optical axis, and the optical imaging lenssatisfies the relationship: (T6+BFL)/T1≥3.300.
 7. The optical imaginglens of claim 1, wherein TL is a distance from the object-side surfaceof the first lens element to the image-side surface of the sixth lenselement along the optical axis, and the optical imaging lens satisfiesthe relationship: TL/(T4+T5)≤5.100.
 8. The optical imaging lens of claim1, wherein T1 is a thickness of the first lens element along the opticalaxis, and the optical imaging lens satisfies the relationship:(T3+G34)/T1≤2.800.
 9. The optical imaging lens of claim 1, wherein TTLis a distance from the object-side surface of the first lens element toan image plane along the optical axis, and the optical imaging lenssatisfies the relationship: TTL/(G12+G34)≤5.700.
 10. The optical imaginglens of claim 1, wherein G23 is an air gap between the second lenselement and the third lens element along the optical axis, and theoptical imaging lens satisfies the relationship: (G23+T3)/T6≤3.100. 11.The optical imaging lens of claim 1, wherein T1 is a thickness of thefirst lens element along the optical axis, and the optical imaging lenssatisfies the relationship: (T3+T5)/T1≤4.000.
 12. The optical imaginglens of claim 1, wherein G56 is an air gap between the fifth lenselement and the sixth lens element along the optical axis, and theoptical imaging lens satisfies the relationship: EFL/(G12+G56)≥1.500.13. The optical imaging lens of claim 1, satisfying the relationship:(T5+T6)/T4≤4.900.
 14. The optical imaging lens of claim 1, wherein TL isa distance from the object-side surface of the first lens element to theimage-side surface of the sixth lens element along the optical axis, BFLis a distance from the image-side surface of the sixth lens element toan image plane along the optical axis, and the optical imaging lenssatisfies the relationship: TL/BFL≤4.200.
 15. The optical imaging lensof claim 1, wherein T2 is a thickness of the second lens element alongthe optical axis, G23 is an air gap between the second lens element andthe third lens element along the optical axis, and the optical imaginglens satisfies the relationship: (G12+G23)/T2≥1.200.
 16. The opticalimaging lens of claim 1, wherein G56 is an air gap between the fifthlens element and the sixth lens element along the optical axis, and theoptical imaging lens satisfies the relationship:G12/(G34+G45+G56)≤3.000.
 17. The optical imaging lens of claim 1,satisfying the relationship: (G12+G45)/T4≤4.600.
 18. The optical imaginglens of claim 1, wherein T1 is a thickness of the first lens elementalong the optical axis, T2 is a thickness of the second lens elementalong the optical axis, and the optical imaging lens satisfies therelationship: (T2+T3+T5)/(T1+T4)≤3.400.
 19. The optical imaging lens ofclaim 1, wherein G56 is an air gap between the fifth lens element andthe sixth lens element along the optical axis, and the optical imaginglens satisfies the relationship: (T5+G56)/T6≤2.700.